brandboat opened a new pull request, #21550:
URL: https://github.com/apache/kafka/pull/21550
Currently, 'num.partitions' and 'default.replication.factor' are applied
inconsistently. Topic auto-creation relies on Broker configs, while
Streams and AdminClient rely on Controller configs. This leads to
confusing behavior where a Broker and Controller might
have diverging defaults.
This commit implements the 4.x transition phase:
- Updated DefaultAutoTopicCreationManager to check if these configs are
explicitly set in 'broker.properties'.
- If NOT explicitly set, the Broker now sends 'NO_NUM_PARTITIONS' and
'NO_REPLICATION_FACTOR' (-1) in the CreateTopicsRequest, allowing
the Controller's configuration to take precedence.
- Added deprecation warnings in KafkaConfig when these properties are
defined in a Broker role, notifying users to migrate them to the
Controller role before 5.0.
- Updated documentation to clarify the precedence logic between
Broker and Controller nodes.
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